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FIGMAS
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First entry: 01/02/16 || Last update: 27/07/21 || Status: accepted
| General information | |
|---|---|
|
Mineral class
Sub-class Group Species |
Silicate Cyclosilicate Benitoite group Benitoite |
| Synthetic? | no |
|
Formula Standard element(s) |
BaTiSi3O9 Ba Ti Si |
| Origin, rock type... | San Benito Co., California, USA |
No images found...
(*) Recommended analysis.
| Analysis 1 | |
|---|---|
| Recommended analysis | |
| Reference | J. Nelen |
| Analysis type | unknown |
| Wt-% oxide | Wt-% element | Atomic | ||
|---|---|---|---|---|
| 43.7501 19.3500 37.0500 | SiO2 TiO2 BaO | 20.4506 11.5974 33.1840 34.9181 | Si Ti Ba O | 3.00374 0.99945 0.99681 9.00318 |
| 100.150 | 100.150 | 14.003 | ||
| Analysis 2 | |
|---|---|
| See analysis 1 for recommended analysis | |
| Reference | Jo Laird (CIT, UWH/UNH?) |
| Method | EMP (average or single point?), emission spectrometry |
| Analysis type | average |
| Analysis comment | Analysis from blue reference book at UMass Amherst labeled Benitoite BLUE; San Benito County (CA). Ba, Si, Ti by microprobe analysis; Al, Fe, Ca by emission spectrometry. |
| Wt-% oxide | Wt-% element | Atom: N/A | ||
|---|---|---|---|---|
| 43.26 19.56 0.20 0.05 0.10 37.22 | SiO2 TiO2 Al2O3 FeO CaO BaO | 20.221 11.724 0.106 0.039 0.071 33.336 34.893 | Si Ti Al Fe Ca Ba O | |
| 100.390 | 100.390 | |||
| Analysis 3 | |
|---|---|
| See analysis 1 for recommended analysis | |
| Reference | Jo Laird (CIT, UWH/UNH?) |
| Method | EMP (average or single point?), emission spectrometry |
| Analysis type | average |
| Analysis comment | Analysis from blue reference book at UMass Amherst labeled Benitoite WHITE; San Benito County (CA). Ba, Si, Ti by microprobe analysis; Al, Fe, Ca by emission spectrometry. |
| Wt-% oxide | Wt-% element | Atom: N/A | ||
|---|---|---|---|---|
| 42.62 19.44 0.04 0.01 0.006 37.27 | SiO2 TiO2 Al2O3 FeO CaO BaO | 19.922 11.652 0.021 0.008 0.004 33.381 34.398 | Si Ti Al Fe Ca Ba O | |
| 99.386 | 99.386 | |||
The spectacular cathodoluminescence (see image above) of benitoite has been used for optimization of electron microbeam instruments for decades; Preliminary CL spectroscopy reveals a peak at about 420 nm.
Smithsonian Institution
PO Box 37012
SI Building, Room 153, MRC 010
Washington, D.C. 20013-7012
USA
https://mineralsciences.si.edu/facilities/standards.htm
Material: mineral (size: > 1.19 mm, 1.0 mm - 0.5 mm, < 0.5 mm)
https://naturalhistory.si.edu/research/mineral-sciences/collections-overview/reference-materials/smithsonian-microbeam-standards
